igraph: layout_with_lgl – R documentation

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Documentation

igraph

layout_with_lgl

Large Graph Layout

Description

A layout generator for larger graphs.

Usage

layout_with_lgl(
  graph,
  maxiter = 150,
  maxdelta = vcount(graph),
  area = vcount(graph)^2,
  coolexp = 1.5,
  repulserad = area * vcount(graph),
  cellsize = sqrt(sqrt(area)),
  root = NULL
)

with_lgl(...)

Arguments

`graph`	The input graph
`maxiter`	The maximum number of iterations to perform (150).
`maxdelta`	The maximum change for a vertex during an iteration (the number of vertices).
`area`	The area of the surface on which the vertices are placed (square of the number of vertices).
`coolexp`	The cooling exponent of the simulated annealing (1.5).
`repulserad`	Cancellation radius for the repulsion (the `area` times the number of vertices).
`cellsize`	The size of the cells for the grid. When calculating the repulsion forces between vertices only vertices in the same or neighboring grid cells are taken into account (the fourth root of the number of `area`.
`root`	The id of the vertex to place at the middle of the layout. The default value is -1 which means that a random vertex is selected.
`...`	Passed to `layout_with_lgl`.

Details

layout_with_lgl is for large connected graphs, it is similar to the layout generator of the Large Graph Layout software (http://lgl.sourceforge.net/).

Value

A numeric matrix with two columns and as many rows as vertices.

Author(s)

Gabor Csardi csardi.gabor@gmail.com